Soft light mode in 2.9.5

Hi,
I’m currently using @partha’s Gimp 2.9.5 build and it seems that finally this has a soft light layer mode, which is not the same as the overlay mode. Can anybody tell me the maths behind that mode?
Thanks

Here is a nice resource with explanation of softlight as well as many other blend modes: Pegtop delphi

I have used it extensively to derive the math for the photoflow blend operators…

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Oh wow with graphs, great I was actually making my own graphs, that’s why I asked. So thank you!!